Magnus salts

On boiling the Magnus salt with ammonia solution, it is converted into the tetraammine... 

Pt(NH3)4][PtCl4] (the so-called Magnus salt poorly soluble)... 

As far as we are aware, the number of luminescent extended systems with gold-platinum interactions is reduced to only one report. This is a puzzling situation since the situation of platinum in the periodic table suggests considerable relativistic effects for this atom and extended chains of squared-planar Pt(II) cation-anion complexes built by metal-metal interactions are not strange. In fact, salts such as [Pt(CNR)4][Pt(CN)4] ,67 which are luminescent and display vapochromic behavior, and the modified form of the Magnus salt [Pt(NH3)4][Pt(CN)4] ,68 which shows semiconducting properties, are examples of this type of supramolecular systems. Therefore, the stable combination of gold and platinum in cation/anion-acid/base systems should be anticipated. 

As MILLER (2) has pointed out, the Magnus salt structure is even favoured electrostatically, with alternating cations and anions... 

Pt(NH3)4l[PtCl4l, Magnus salt , dark-gm, in str. — columns alternate squares anions and cations... 

Clever GH, Kawamura W, Tashiro S, Shiro M, Shionoya M (2012) Stacked platinum complexes of the magnus salt type inside a coordination cage. Angew Chem Int Ed 51(11) 2606-2609... 

In 1920, based on relatively few experimental data (only about 10 reactions were known), Chugaev concluded that Magnus salts, [PtL4][PtX4] (X = Cl, Br L = amines, thioethers), were subject to solid-state rearrangement upon heating, Eq. 1.6 ... 

Magnus s salt is an electrolyte and non-ionized polymerization isomers (p. 921) of the stoichiometry PtCl2(NH3)2 are also known which can be prepared as monomeric cis and Irons isomers ... 

Magnus green salt takes its name from its discoverer (1828), H.G. Magnus, Professor of Physics and Technology at the University of Berlin. Pink [Pd(NH3)4]PdCl4, Vauqelin s salt, was discovered slightly earlier (1813) by L.-N. Vauquelin, Professor of Chemistry at the College de France. 

Reaction of the diphosphines Ph2P(CH2) PPh2 (n = 1-3) with MCl2(PhCN)2 affords 1 1 m-complexes (Figure 3.46) [102]. (Note the use of the labile PhCN adducts if the MCl salts are used, Magnus type compounds M(P-P)2+MCl4- are formed.) Similar complexes are formed with other halides for the thiocyanates see section 3.8.6. The structures of the palladium complexes have been determined (Table 3.10) with square coordination only achieved for n = 3 with the formation of a six-membered metal-chelate ring. 

Such thiocyanate complexes are usually made by reaction of the ligand (L-L) with Pd(SCN)4- in a solvent like ethanol. A substantial amount of the Magnus-type salt [Pd(L-L)2][Pd(SCN)4] is often produced, convertible to the neutral Pd(L-L)(NCS)2 by dissolution in hot DMF and reprecipitating with water. 

In the complex [Co(NH3)6]Cl3, the cation is [Co(NH3)6]3+, and it is named first. The coordinated ammonia molecules are named as ammine, with the number of them being indicated by the prefix hexa. Therefore, the name for the compound is hexaamminecobalt(III) chloride. There are no spaces in the name of the cation. [Co(NH3)5C1]C12 has five NH3 molecules and one CN coordinated to Co3+. Following the rules just listed leads to the name pentaamminechlorocobalt(III) chloride. Potassium hexacyanoferrate(III) is K3[Fe(CN)6j. Reinecke s salt, NH4[Cr(NCS)4(NH3)2], would be named as ammonium diamminetetrathiocyanatochro mate (III). In Magnus s green salt, [Pt(NH3)4][PtCl4], both cation and anion are complexes. The name of the complex is tetraammineplatinum(II) tetrachloroplatinate(II). The compound [Co(en)3](N03)3 is named as tris(ethylenediamine)cobalt(III) nitrate. 

Other square planar Pt(II) complexes able to form infinite unidirectional chains in the solid state are known, in particular the Magnus s green salt [Pt(NH3)4][PtCl4],u but also Pt(I) complexes such as [Pt(bipy)2](N03) 2FI20 (obtained by electrochemical reduction of [Pt(bipy)2](NC>3)2 H20) have recently shown linear chain crystals (Pt-Pt = 3.56 A).12... 

Rundle and others (7, 105, 217) have suggested that the interaction between the metal atoms in these compounds is bonding, and that it is largely responsible for the uptake of the structure. So far as the analogues of Magnus s green salt are concerned, it has been shown that the structure... 

The first ammino-derivative of palladium was prepared by Vauquclin in 1813.1 Vauquelin s salt, the chloropalladite of tetranunino-palladium, [Pd(NH3)4]PdCl1, corresponds to the green salt of Magnus, the first known compound of the ammino-platinum salts. 

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